Tài liệu Linux Device Drivers-Chapter 14 :Network Drivers ppt

... ltalk_setup(struct net _device *dev); Sets up the fields for a LocalTalk device. void fc_setup(struct net _device *dev); Initializes for fiber channel devices. void fddi_setup(struct net _device *dev); ... printk("snull: error %i registering device \"%s\"\n", result, snull_devs[i].name); else device_ present++; Initializing Each Device Probing for the...

Ngày tải lên: 21/01/2014, 07:20

... 1 :An Introduction to Device Drivers As the popularity of the Linux system continues to grow, the interest in writing Linux device drivers steadily increases. Most of Linux is independent ... by Linux, somebody somewhere has written a driver to make it work with the system. Without device drivers, there is no functioning system. Device drivers take on a special role...

Ngày tải lên: 24/12/2013, 01:17

... to Device Drivers& quot;. #define MODULE #include < ;linux/ module.h> buffer-based graphics environments, where the X server acts only as a server based on a real kernel-space device ... users.  The most important devices can't be handled in user space, including, but not limited to, network interfaces and block devices. As you see, user-space drivers can't d...

Ngày tải lên: 24/12/2013, 01:17

... /dev/$ {device} [0-3] major=`awk "\\$2==\"$module\" {print \\$1}" /proc/devices` mknod /dev/$ {device} 0 c $major 0 mknod /dev/$ {device} 1 c $major 1 mknod /dev/$ {device} 2 ... random-access device, one device or many, and so on. To make scull be useful as a template for writing real drivers for real devices, we'll show you how to implement several...

Ngày tải lên: 24/12/2013, 01:17

... limit; i++) { Scull_Dev *d = &scull_devices[i]; if (down_interruptible(&d->sem)) return -ERESTARTSYS; len += sprintf(buf+len,"\nDevice %i: qset %i, q %i, sz %li\n", ... related to serious hardware or software failures. KERN_ERR Used to report error conditions; device drivers will often use KERN_ERR to report hardware difficulties. } This is a fairly ty...

Ngày tải lên: 24/12/2013, 01:17

... the same device) is best solved by implementing one device node for each access policy. An example of this practice can be found in the Linux tape driver, which provides multiple device files ... same device. Different device files will, for example, cause the drive to record with or without compression, or to automatically rewind the tape when the device is closed. Cloning...

Ngày tải lên: 24/12/2013, 01:17

... available in Linux 2.0, sysdep.h fills the gap. Task Queues One feature many drivers need is the ability to schedule execution of some tasks at a later time without resorting to interrupts. Linux ... #include < ;linux/ delay.h> void udelay(unsigned long usecs); Chapter 6 : Flow of Time At this point, we know the basics of how to write a full-featured char module. Real-world...

Ngày tải lên: 24/12/2013, 01:17

... freeing of memory. The Linux kernel offers a richer set of memory allocation primitives, however. In this chapter we look at other ways of making use of memory in device drivers and at how to ... GFP_KERNEL and GFP_ATOMIC, although those two cover most of the needs of device drivers. All the flags are defined in < ;linux/ mm.h>: individual flags are prefixed with a double u...

Ngày tải lên: 24/12/2013, 01:17

... scull and similar toys is a good introduction to the software interface of a Linux device driver, implementing a real device requires hardware. The driver is the abstraction layer between software ... easy to use. I/O Ports and I/O Memory Every peripheral device is controlled by writing and reading its registers. Most of the time a device has several registers, and they are ac...

Ngày tải lên: 24/12/2013, 01:17

... :Interrupt Handling Although some devices can be controlled using nothing but their I/O regions, most real-world devices are a bit more complicated than that. Devices have to deal with the external ... can explicitly be shared. So Linux supports shared interrupts and on all buses where it makes any sense, not just the PCI. Thus, suitably aware drivers for ISA devices can also share a...

Ngày tải lên: 24/12/2013, 01:17